Method of making stannic chloride



Oct- 13,1931- w. s. LIENHARDT 1,826Q800- METHOD OFMAKING STANNIC cHLoRIDE l Filed Aug.' 27, 1929 INVENTOR H15 A TTORNEY Patented Oct. ,13, 1931 UNITEDy STATES,

WINFIELD scHLEY LIENHARDT,-or sTAPLEToN, NEWYonx; i i I PATENT METHOD F MAKING SVTANNIC CIILORIDE Appncation mea August 27, m29. VSerin Napasasn, l

y This invention relates to methods of mal;- lng stannic chloride, and 1t comprises a pr0- cess of producing stannic chloride from tinv and ehlorin wherein molten tin is chlorinat- L5 ed as a free burning flame or spray in an uni' obstructed chamber containing` a replenished atmosphere of chlorin, said atmosphere being rcycllcally circulated to, through and back from cooling devices adapted to condense and 1() remove vapors of. stannic chloride; all as temperature cannot rise abovev the boilingA point of SnCli, or 1140 C., and as dry chlorin` g does not attack iron at this or lower temperatures, simple iron or steel apparatus can be used. TheV process is, however, not well adapted for large scale operation and rapid work. In order to keep the temperature down, it is necessaryto use relatively small apparatus units, and the rate of operation is restricted by the necessity for disposing of the heat evolved in chlorination, and further, usually, by the vrate at whichchlorin dissolved in tin chloride gains access to the tin. In most of these processes the actual chlorinating` agent is a stannic chloride solution of chlorin. There also are mechanical diilficulties in replenishment with solidtin in continuous operation without permitting escape of poisonous gases and vapors. The apparatus. is better adapted for batch operation thanA for continuous operation.

Itis the purpose of the present invention to enable continuous large scale operation without the necessity :tor maintenance of any low or particular temperature in the zone of react-ion. Molten tin takes tire on contact with chlorin and burns freely withformation yof vapors ot SnCl4. Advantage is taken of this fact in the present invention, a spray or I jet of molten metallic tin being directed aX- ially down into an unobstructed chamber containing chlorin. Y The tin takes fire and burns as a sort of freeame where the spray is of proper character. In any event, with a chamber oit reasonable depth droplets of tin are burnt yduring fall., Development V'off heat is ata pointfremote from the chamber walls and the high temperatures developedfin the flamev l do no harm. "The whole Chambermay. be of water cooled iron or steel, or it'may ber O f 'chlorin resistant'ceramicmateriah The com# Y bustlon ,producesv vapors of fstanni'c .'chlor1de, y

and to secure ausharply defined quick burning flame with localized development of f heat it is desirable to maintain thejconcentration of -V SnClirin the chamber atmosphere'as low as may be.' To his end, the chamber atmospherel is kept'circulating ina closed cire'uitthrough Chilling @cils Where the,'SnClifis'jcoridnsed Yand removed. c

"Infthe" describedoperati'on 'enormous' dal 1 pacity can be secured with relatively Qsxnall n vand simple apparatus. VH1 .Capacityv does'not f dependfinfany'way upon thesize of the Iehloffrinating chamber'which need beonlylarge flame, and the .only limitation, isthe speed through the chilling coils.

' shown, more or less diagrammaticallyfanorenough to provide propers'pacingof the'tin ganizationof apparatus elements within'the present invention and capable of luse in'per-vV forming the described process. In this showing the view is partly in section and partly elevation. In the showing, element l() is a casing of iron or steel, which,'as shown, is wateracketi ed,'being provided `with jacket 11 aving water inlet 12 and outlet 13.

Vdefines a vertically elongated reaction cham` ber, the downward extension giving ampleto a chilling and collecting chamber 15, jacki t' eted by casing 16, provided with water inlet 17 and outlet 18.y .At the bottom, the collect# chamber 15l is provided with a valved ing Vliquid outlet 19 and at the top connects with This casingy circulating pipe 20leading past blower 21 il?? Y back to the reaction chamber. Chlorin is supplied to the reaction chamber through inlet 22 and tin through nozzle 23, supplied with molten tin from reservoir 24.

In operation, molten tin is sprayed or fed into the hot chamber through nozzle 23 and burns es alleine at the expense of the chamber chlorin and of that entering 'through inlet 22. It is simpler to introduce the tin and chlorin as two neighboring jets rather than send both through e spray nozzle, and quite as eii'ective. Circulating pump 21 heilig in operation7 chamber gases are sent through cooler 15 and stripped of SnCh, being then returned to the reaction chamber. 'The gases leaving throughvv 14 being hotter than those returned through 20, there is an advantageous convectional circulation within the chamber below vthe end of the tin flame. hlorin inlet 22 supplies reshchlorin directly` to the tin llame. The maximum concentration of SnCli in the chamber atmosphere is always at points well below the tin flame.v i lvhat I claim is: v Y Y 1. In theinanufacture ot' stennic chloride from tin and chlorinina continuous manner, Athe processfwhich ,comprisesspraying molten tininto an atmosphere of Chlor-in, withdrawing the reaction mixture cooling the reaction mixture to condense and `sepa-rate stannic chloride from uncombined chlorin, and returningthe uncombined chlorin to react with anotherportion of molten tin. f 2.'.,Inithe manufacture of stannic chloride from tin and chlorin in a continuous manner, the process which comprises spraying molten tin into an atmosphere of chlorin, withdrawing the gaseous reaction mixture, cooling it to condense and separate stannic chloride from the uncombined chlorin, returning ,the un- ,oombined chlorin to the reaction zone, and introducing fresh ohlorin to compensate for chlorin. consumed in the process.

. n testimony whereof l affix my signature.

- I WINFIELD SCHLEY LIENHARDT. 

